Echo-acoustic flow dynamically modifies the cortical map of target range in bats.

Area of Science:

• Neuroscience
• Bioacoustics
• Sensory Processing

Background:

• Echolocating bats rely on echo delay to determine target range for survival.
• Auditory cortex in bats typically maps target range based on echo delay.
• Acoustic information flow during flight ('echo-acoustic flow') is critical for real-time navigation.

Purpose of the Study:

• To investigate how echo-acoustic flow dynamically modifies the auditory cortex map of target range in bats.
• To determine if bats represent echo delay or geometric target information during flight.

Main Methods:

• Used dynamic acoustic stimulation in a virtual reality environment.
• Performed extracellular recordings in the auditory cortex of the bat Phyllostomus discolor.
• Analyzed neural responses to varying echo-acoustic flow and target geometry.

Main Results:

• The map of target range in the auditory cortex is dynamically altered by echo-acoustic flow.
• Neurons encode the geometric relation between targets and flight trajectory, not just echo delay.
• Representation of close targets expands as lateral passing distance decreases.

Conclusions:

• Bat auditory cortex dynamically adapts target range representation based on flight context.
• This flow-dependent neural plasticity aids in processing spatial information for adaptive behaviors.
• Findings suggest a sophisticated neural mechanism for real-time environmental interaction.